'use strict';
/**
 * uuid 实现
 */
class UUID {


    /**
     * 获取伪随机uuid
     * @return {string} 带下划线的uuid
     */
    static randomUUID() {
        // let s = [];
        // let hexDigits = "0123456789abcdef";
        // for (var i = 0; i < 36; i++) {
        //     s[i] = hexDigits.substr(Math.floor(Math.random() * 0x10), 1);
        // }
        // s[14] = "4"; // bits 12-15 of the time_hi_and_version field to 0010
        // s[19] = hexDigits.substr((s[19] & 0x3) | 0x8, 1); // bits 6-7 of the clock_seq_hi_and_reserved to 01
        // s[8] = s[13] = s[18] = s[23] = "-";
        //
        // let uuid = s.join("");
        // return uuid;


        return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
            const r = Math.random() * 16 | 0, v = c === 'x' ? r : r & 0x3 | 0x8
            return v.toString(16)
        });
    }
}

module.exports = UUID
